/**
 * 实例数据看板:拉 /api/instance/dashboard 渲染只读区块.
 */
(function (global) {
  const SECTION_ORDER = ["orders", "keys", "strategy", "options", "hedge_plan"];
  let loading = false;
  let timer = null;

  function root() {
    const active = document.querySelector('.embed-tab-pane.is-active-pane [data-inst-dashboard="1"]');
    if (active) return active;
    return document.getElementById("instance-dashboard");
  }

  function escapeHtml(s) {
    return String(s == null ? "" : s)
      .replace(/&/g, "&")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/"/g, "&quot;");
  }

  function fmtNum(v) {
    if (v == null || v === "") return "—";
    const n = Number(v);
    if (!Number.isFinite(n)) return escapeHtml(v);
    return String(n);
  }

  function fmtPnl(v) {
    if (v == null || v === "") return "";
    const n = Number(v);
    if (!Number.isFinite(n)) return "";
    const cls = n > 0 ? "pos-pnl-profit" : n < 0 ? "pos-pnl-loss" : "";
    const sign = n > 0 ? "+" : "";
    return '<span class="' + cls + '">' + sign + n.toFixed(2) + "U</span>";
  }

  function goTab(tab) {
    if (!tab) return;
    if (global.InstanceEmbed && typeof global.InstanceEmbed.loadTab === "function") {
      global.InstanceEmbed.loadTab(tab);
      return;
    }
    const pathMap = {
      trade: "/trade",
      key_monitor: "/key_monitor",
      strategy: "/strategy",
      options: "/options",
      hedge_plan: "/hedge-plan",
    };
    const path = pathMap[tab] || "/" + tab;
    location.href = path;
  }

  function renderItems(items) {
    if (!items || !items.length) {
      return '<p class="inst-dash-empty muted">暂无</p>';
    }
    return (
      '<div class="inst-dash-list">' +
      items
        .map(function (it) {
          const meta = [];
          if (it.entry != null) meta.push("入场 " + fmtNum(it.entry));
          if (it.stop_loss != null) meta.push("止损 " + fmtNum(it.stop_loss));
          if (it.take_profit != null) meta.push("止盈 " + fmtNum(it.take_profit));
          if (it.upper != null || it.lower != null) {
            meta.push("上 " + fmtNum(it.upper) + " / 下 " + fmtNum(it.lower));
          }
          const pnlHtml = fmtPnl(it.pnl);
          if (pnlHtml) meta.push(pnlHtml);
          return (
            '<button type="button" class="inst-dash-item" data-dash-tab="' +
            escapeHtml(it.tab || "") +
            '">' +
            '<div class="inst-dash-item-title">' +
            escapeHtml(it.title || "-") +
            "</div>" +
            (it.subtitle
              ? '<div class="inst-dash-item-sub muted">' + escapeHtml(it.subtitle) + "</div>"
              : "") +
            (meta.length ? '<div class="inst-dash-item-meta">' + meta.join(" · ") + "</div>" : "") +
            "</button>"
          );
        })
        .join("") +
      "</div>"
    );
  }

  function renderSection(key, sec) {
    if (!sec) return "";
    if ((key === "options" || key === "hedge_plan") && !sec.visible) return "";
    const count = Number(sec.count) || 0;
    return (
      '<section class="inst-dash-section" data-dash-section="' +
      escapeHtml(key) +
      '">' +
      '<div class="inst-dash-section-head">' +
      "<h3>" +
      escapeHtml(sec.title || key) +
      ' <span class="inst-dash-count">' +
      count +
      "</span></h3>" +
      '<button type="button" class="btn-sm inst-dash-goto" data-dash-tab="' +
      escapeHtml(sec.tab || "") +
      '">打开</button>' +
      "</div>" +
      renderItems(sec.items || []) +
      "</section>"
    );
  }

  function bindClicks(el) {
    if (!el) return;
    el.querySelectorAll("[data-dash-tab]").forEach(function (btn) {
      btn.addEventListener("click", function () {
        goTab(btn.getAttribute("data-dash-tab"));
      });
    });
  }

  async function load(opts) {
    const el = root();
    if (!el) return;
    const status = el.querySelector("#inst-dash-status") || document.getElementById("inst-dash-status");
    const sections = el.querySelector("#inst-dash-sections") || document.getElementById("inst-dash-sections");
    const updated = el.querySelector("#inst-dash-updated") || document.getElementById("inst-dash-updated");
    if (loading) return;
    loading = true;
    if (status && !(opts && opts.silent)) status.textContent = "加载中…";
    try {
      const res = await fetch("/api/instance/dashboard", { credentials: "same-origin" });
      const data = await res.json().catch(function () {
        return {};
      });
      if (!res.ok || !data.ok) {
        throw new Error(data.msg || res.statusText || "加载失败");
      }
      if (updated) updated.textContent = "更新 " + (data.updated_at || "—");
      if (sections) {
        sections.innerHTML = SECTION_ORDER.map(function (k) {
          return renderSection(k, data[k]);
        }).join("");
        bindClicks(sections);
      }
      if (status) status.textContent = "";
    } catch (e) {
      if (status) status.textContent = e.message || "加载失败";
    } finally {
      loading = false;
    }
  }

  function stopAuto() {
    if (timer) {
      clearInterval(timer);
      timer = null;
    }
  }

  function startAuto() {
    stopAuto();
    timer = setInterval(function () {
      const el = root();
      if (!el) return;
      const pane = el.closest(".embed-tab-pane");
      if (pane && !pane.classList.contains("is-active-pane")) return;
      load({ silent: true });
    }, 15000);
  }

  function init(force) {
    const el = root();
    if (!el) return;
    if (!force && el.getAttribute("data-dash-booted") === "1") {
      load({ silent: true });
      startAuto();
      return;
    }
    el.setAttribute("data-dash-booted", "1");
    const btn = el.querySelector("#inst-dash-refresh") || document.getElementById("inst-dash-refresh");
    if (btn && !btn.getAttribute("data-bound")) {
      btn.setAttribute("data-bound", "1");
      btn.addEventListener("click", function () {
        load({});
      });
    }
    load({});
    startAuto();
  }

  function refreshSoft(opts) {
    load(Object.assign({ silent: true }, opts || {}));
  }

  global.InstanceDashboard = {
    init: init,
    refreshSoft: refreshSoft,
    load: load,
    stopAuto: stopAuto,
  };
})(window);